This standard specifies the limits and test methods for the specific activity of natural radionuclides radium-226, thorium-232 and potassium-40 in building materials. This standard applies to inorganic non-metallic building materials used in the construction of various types of buildings, including building materials mixed with industrial waste residues. GB 6566-2001 Limits of radionuclides in building materials GB6566-2001 Standard download decompression password: www.bzxz.net

ICS 13. 030. 01
National Standard of the People's Republic of China
GB 6566 - 2001wwW.bzxz.Net
Replaces GB6566-2000, GB6763—2000 Limit of radionuclides in building materials
Limit of radionuclides in building materialsIssued on December 10, 2001
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on January 1, 2002
GB6566—2001
Chapter 3 of this standard contains mandatory provisions, and the rest are recommended provisions.
This standard shall, from the date of entry into force, simultaneously abolish GB6566-2000 "Radiation Health Protection Standard for Building Materials", GB6763-2000 "Control Requirements for Radioactive Substances in Building Materials Products and Industrial Waste Slag Used in Building Materials" and building materials industry standard JC518-1993 (96) "Radiation Protection Classification Control Standard for Natural Stone Products".
Compared with GB6566--2000, GB6763--2000 and JC518-1993 (96), this standard has the following major changes: - Building materials are divided into main building materials for building main works and decoration materials for building facings. The limits of specific activity of natural radionuclides in main building materials are stipulated, and no classification management is required; the requirements for classification management of decoration materials are clarified; the detection methods of radionuclides no longer refer to GB/T11713-~1989 and GB/T11743-1989 standards; the specific content of the limit requirements for industrial waste slag used in building materials is deleted; the method of using radiation dose rate detection for determination and the pre-evaluation criteria for radioactivity levels in stone deposit exploration are deleted; from January 1, 2002, the products produced by production enterprises shall comply with this national standard, with a transition period of 6 months; from July 1, 2002, the products that do not meet this national standard shall be stopped from being sold on the market. This standard is proposed by China Building Materials Industry Association. The drafting units of this standard are: China Building Materials Science Research Institute, Industrial Hygiene Laboratory of the Ministry of Health, China Building Materials Industrial Geological Exploration Center, China University of Geosciences (Beijing).
The drafting organizations of this standard include China Stone Industry Association, Fujian Xuanwu Stone Co., Ltd., Shandong Rongcheng Zhonglei Stone Co., Ltd., and National Radioactive Supervision and Inspection Center for Building Materials.
The main drafters of this standard include Ma Zhenzhu, Wang Nanping, Yang Qinyuan, Ren Tianshan, and Wang Yuhe. The previous versions of the standards replaced by this standard are: GB6566--1986.GB6566-2000;
-GB 6763--1986.GB 6763-2000.812
1 Scope
Limits of radioactive nuclides in building materials
GB 6566-2001
This standard specifies the limits and test methods for the specific activity of natural radionuclides radium-226, -232, and potassium-40 in building materials. This standard applies to inorganic non-metallic building materials used in the construction of various types of buildings, including building materials mixed with industrial waste residues. 2 Terms and definitions
The following terms and definitions apply to this standard. 2.1
Building materials
Building materials in this standard refer to inorganic non-metallic materials used in the construction of various types of buildings. This standard divides building materials into main building materials and decorative materials. 2.1.1
Main materials for building Building materials used in the construction of the main engineering of buildings. Including: cement and cement products, bricks, tiles, concrete, prefabricated concrete components, blocks, wall insulation materials, industrial waste residues, building materials mixed with industrial waste residues and various new wall materials. 2.1.2
Decorative materials Building materials used for indoor and outdoor decoration of buildings. Including: granite, architectural ceramics, gypsum products, ceiling materials, painting materials and other new finishing materials.
Building
Houses or indoor spaces for human production, work, life or other activities. According to the different uses of buildings, this standard divides buildings into two categories: civil buildings and industrial buildings. 2.2.1
Civil buildings
Buildings for human residence, work, study, entertainment and shopping. This standard divides civil buildings into the following two categories: Class I civil buildings: such as residential buildings, elderly apartments, nurseries, hospitals and schools. Class II civil buildings: such as shopping malls, gymnasiums, bookstores, hotels, office buildings, libraries, cultural and entertainment venues, exhibition halls and public transportation waiting rooms.
Industrial buildings
Buildings for human production activities. Such as production workshops, packaging workshops, maintenance workshops and warehouses. 2.3
Internal exposure index
internal exposure index
In this standard, internal exposure index refers to: the quotient obtained by dividing the radioactivity of the natural radionuclide radium-226 in building materials by the limit specified in this standard.
GB 6566-—2001
In the formula:
IRa internal exposure index;
The expression is: IRa
Cka—~The radioactivity of the natural radionuclide radium-226 in building materials, in Bq·kg\; 200—The radioactivity limit of the radionuclide radium-226 in building materials specified in this standard, in Bqkg-1, when only internal exposure is considered.
External exposure indexexternal exposure index in this standard refers to: the sum of the quotients of the radioactive specific activities of the natural radionuclides radium-226, promethium-232 and potassium-40 in building materials divided by the limits specified in this standard when they exist separately. The expression is: 1=
In the formula:
CR,CTh,CK--
370, 260, 4 200-
External exposure index:
is the radioactive specific activities of the natural radionuclides radium-226, promethium-232 and potassium-40 in building materials, respectively, in becquerel/kilogram (Bq·kg-1);
is the limits specified in this standard when they exist separately, in becquerel/kilogram (Bq·kg-1) when only external exposure is considered.
Specific activity The specific activity of a certain nuclide refers to the quotient obtained by dividing the radioactivity of a certain nuclide in a substance by the mass of the substance. The expression is: C =
Wherein:
C-specific activity, in becquerel/kilogram (Bq·kg-1); A-nuclide radioactivity, in becquerel (Bq); m-mass of a substance, in kilogram (kg). 2.6
Uncertainty of measurementA
Uncertainty of measurement is the evaluation of the true value of the measured value within a certain range of values, that is, the degree of deviation between the measured value and the actual value. 2.7
Hole rate
In this standard, the hollow rate refers to the percentage of the hollow volume of hollow building materials to the volume of the entire hollow building materials. 3 Requirements
3.1 Main building materials
When the radioactivity specific activity of natural radionuclides radium-226, promethium-232, and potassium-40 in the main building materials simultaneously meets IRa≤1.0 and I≤1.0, their production, sales, and use are not restricted. For main building materials with a hollow ratio greater than 25%, when the radioactivity specific activity of natural radionuclides radium-226, promethium-232, and potassium-40 simultaneously meets IR≤1.0 and 1≤1.3, their production, sales, and use are not restricted. 3.2 Decoration materials
This standard recommends that decoration materials be divided into the following three categories according to their radioactivity levels: 3.2.1 Category A decoration materials
GB 6566--2001
Decoration materials whose radioactivity specific activities of natural radionuclides radium-226, proton-232, and potassium-40 meet the requirements of 1Ra≤1.0 and 1≤1.3 are Category A decoration materials. The production, sales, and use of Category A decoration materials are not restricted. 3.2.2B-type decoration materials
Those that do not meet the requirements of A-type decoration materials but meet the requirements of IRa≤1.3 and 1≤1.9 are B-type decoration materials. B-type decoration materials cannot be used for the interior surfaces of Class 1 civil buildings, but can be used for the exterior surfaces of Class 1 civil buildings and the interior and exterior surfaces of all other buildings. 3.2.3C-type decoration materials
Those that do not meet the requirements of A-type and B-type decoration materials but meet the requirements of I<2.8 are C-type decoration materials. C-type decoration materials can only be used for the exterior surfaces of buildings and other outdoor purposes.
3.2.4Granite with I>2.8 can only be used in places rarely visited by humans, such as monuments, seawalls, and bridge piers. 4Test methods
4.1Instrument
Low-background multi-channel spectrometer.
4.2Sampling and sample preparation
4.2.1Sampling
Randomly select two samples, each of which is not less than 3kg. One part is sealed and preserved, and the other part is used as the test sample. 4.2.2 Sample preparation
Crush the test sample and grind it to a particle size not greater than 0.16mm. Put it in a sample box with the same geometric shape as the standard sample, weigh it (accurate to 1g), seal it, and wait for testing. 4.3 Measurement
When the natural radioactive decay chain in the test sample basically reaches equilibrium, use a low-background multi-channel spectrometer to measure the specific activity of radium-226, promethium-232 and potassium-40 under the same measurement conditions as the standard sample. 4.4 Requirements for measurement uncertainty
When the sum of the specific activity of radium-226, promethium-232 and potassium-40 in the sample is greater than 37Bq·kg-1, the test method specified in this standard requires that the measurement uncertainty (expansion factor K=1) is not greater than 20%. 5 Inspection rules
5.1 The radioactive specific activities of radium-226, promethium-232 and potassium-40 listed in this standard are all type inspection items. 5.1.1 Under normal production conditions, type inspection shall be carried out at least once a year. 5.1.2 Type inspection shall be carried out at any time when any of the following situations occurs: - When a new product is finalized:
When there are major changes in the production process and raw materials; When the product is produced in a different place;
5.2 Determination of inspection results
5.2.1 When the inspection results of the main building materials meet Article 3.1, they are judged to be qualified. 5.2.2 The inspection results of decoration materials shall be classified and judged according to Article 3.2. 6 Other requirements
6.1 When waste residue is used to produce building materials, the radioactivity level of the product shall meet the requirements of this standard. 6.2 When an enterprise changes the source or proportion of raw materials in production, it must conduct a radioactive nuclide specific activity test in advance to ensure that the product meets the requirements of this standard.
GB65662001
6.3 During the exploration of granite deposits, the radioactivity level of the granite deposits must be pre-evaluated using the decoration material classification control values ​​specified in this standard.
6.4 Decoration material manufacturers shall indicate the radioactivity level category of their products in their product packaging or instructions in accordance with the requirements of Article 3.2 of this standard. 6.5 When selling their products, each enterprise shall hold a natural radioactive nuclide inspection report issued by a qualified testing agency that complies with the provisions of this standard.
6.6 In areas with high natural radioactive background, building material products produced solely from local raw materials may be used only in the area as long as their radioactivity specific activity is not greater than the average background level of the corresponding natural radioactive nuclides in the local surface soil. 816
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